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Title:
Cr含有鋼の鋳造方法
Document Type and Number:
Japanese Patent JP4635954
Kind Code:
B2
Abstract:

To suppress a slab defect of blow holes in a method for casting a Cr-containing steel such as a stainless steel to form into the stock for a seamless steel pipe.

In the method, a steel having a composition comprising, by mass, ≤0.04% C, 0.10 to 1.00% Si, 0.1 to 1.5% Mn, 20.0 to 30.0% Cr, 5.0 to 11.0% Ni, 0.5 to 6.0% Mo, 0.001 to 0.05% Al and 0.2 to 0.5% N, and the balance Fe with impurities wherein the content of S is ≤0.010% and the content of P is ≤0.030% is cast. The casting is performed under the conditions where, provided that the content (mass%) of diffusible hydrogen, the content (mass%) of nitrogen and the content (mass%) of Cr in the steel are defined as [%H], [%N] and [%Cr], and the cross-sectional area (m2) at the inside face of a casting mold is defined as A, the relations among the diffusible hydrogen content, the nitrogen content, the Cr content and the cross-sectional area A satisfy 0.16 log[%H]+log[%N]≤0.05[%Cr]-0.34A-2.208. Blow holes are suppressed, and its quality and productivity can be made consistent.

COPYRIGHT: (C)2008,JPO&INPIT


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Inventors:
Shinya Yamamoto
Tsuneo Kondo
Hiroshi Hayashi
Application Number:
JP2006132813A
Publication Date:
February 23, 2011
Filing Date:
May 11, 2006
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B22D7/00; B22D11/00; C22C38/00; C22C38/44; C22C38/54; C21C7/00; C21C7/076
Domestic Patent References:
JP3130348A
JP4165019A
JP2003041351A
Attorney, Agent or Firm:
Tetsuya Mizoue
Yoshinori Iwahara